package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * ClassName: ReportServiceImpl
 * Package: com.sky.service.impl
 * Description:
 *
 * @Author zhangdingye
 * @Create 2025/4/2 下午6:17
 * @Version 1.0
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    // 注入mapper
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;

    // 注入运营报表Service
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 营业额统计
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        // 用于存放从begin到end范围内所有的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            //日期计算，获得指定日期后1天的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            // 查询date日期对应的营业额：所有状态为已完成订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // select sum(amount) from orders where order_time >= beginDate and order_time < endDate and status = 5;
            // 构建参数Map
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);

            Double turnover = orderMapper.sumByMap(map);

            // 如果为空，则设置为0
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        // 数据封装
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }


    /**
     * 用户统计
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        // 用于存放从begin到end范围内所有的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            //日期计算，获得指定日期后1天的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        // 获取总用户数 select count(id) from user where create_time < end;
        List<Integer> totalUserList = new ArrayList<>();
        // 获取新增用户数 select count(id) from user where create_time < end and create_time > begin;
        List<Integer> newUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            // 查询date日期对应的营业额：所有状态为已完成订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // 构建参数Map
            Map map = new HashMap();
            map.put("end", endTime);

            Integer totalUser = userMapper.countByMap(map);
            totalUser = totalUser == null ? 0 : totalUser;
            totalUserList.add(totalUser);

            // 防止查询语句begin始终有值，结果始终为newUserList
            map.put("begin", beginTime);


            Integer newUser = userMapper.countByMap(map);
            newUser = newUser == null ? 0 : newUser;
            newUserList.add(newUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }


    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        // 用于存放从begin到end范围内所有的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            //日期计算，获得指定日期后1天的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        // 每天订单总数集合 select count(id) from orders where order_time < end and order_time > begin;
        List<Integer> orderCountList = new ArrayList<>();
        // 每天有效订单总数集合 select count(id) from orders where order_time < end and order_time > begin and status = 5;
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //查询每天的总订单数
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            orderCountList.add(orderCount);

            //查询每天的有效订单数
            Integer completedOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            validOrderCountList.add(completedOrderCount);
        }


        /*
        重复查询，优化代码

        List<Integer> orderTotalCountList = new ArrayList<>();
        List<Integer> completedOrderTotalCountList = new ArrayList<>();

        for (LocalDate date : dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // 时间区间内的订单总数 select count(id) from orders where order_time < end;
            Integer orderTotalCount = getOrderCount(null, endTime, null);
            orderTotalCountList.add(orderTotalCount);
            // 时间区间内的有效订单总数 select count(id) from orders where order_time < end and status = 5;
            Integer completedOrderTotalCount = getOrderCount(null, endTime, Orders.COMPLETED);
            completedOrderTotalCountList.add(completedOrderTotalCount);
        }
         */
        Integer totalOrderCount = orderCountList.stream().reduce( Integer::sum).get();
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //订单完成率
        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 根据时间区间统计指定状态的订单数量
     * @param beginTime
     * @param endTime
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
        // 构建参数Map
        Map map = new HashMap();
        map.put("begin", beginTime);
        map.put("end", endTime);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }



    /**
     * 销量排名top10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);

        String nameList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()), ",");
        String numberList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList()), ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }


    /**
     * 导出近30天的运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        // 设置查询起止时间
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);

        // 查询概览数据，提供给Excel模板文件
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(
                LocalDateTime.of(begin, LocalTime.MIN),
                LocalDateTime.of(end, LocalTime.MAX));

        // 构建一个输入流对象，用于读取Excel模板文件
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        // 创建一个Excel表格对象，读取模板文件
        try {
            // 基于提供好的模板文件创建一个新的Excel表格对象
            XSSFWorkbook excel = new XSSFWorkbook(inputStream);

            // 获取第一个sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            // 填充数据--起止时间
            sheet.getRow(1).getCell(1).setCellValue("时间" + begin + "至" + end);

            // 获取第三行，用于填充数据
            XSSFRow row = sheet.getRow(3);

            // 填充数据--营业额
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            // 填充数据--订单完成数
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            // 填充数据--新增用户数
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            // 获取下一行
            row = sheet.getRow(4);
            // 填充数据--有效订单数
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            // 填充数据--平均客单价
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            for (int i = 0; i < 30; i++){
                LocalDate date = begin.plusDays(i);
                // 获取日期对应的营业额
                businessDataVO = workspaceService.getBusinessData(
                        LocalDateTime.of(date,LocalTime.MIN),
                        LocalDateTime.of(date, LocalTime.MAX));
                // 从第 7+i 行开始填充数据
                row = sheet.getRow(7 + i);

                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessDataVO.getTurnover());
                row.getCell(3).setCellValue(businessDataVO.getValidOrderCount());
                row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessDataVO.getUnitPrice());
                row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            }

            //通过输出流将文件下载到客户端浏览器中
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            // 关闭资源
            out.flush();
            out.close();
            excel.close();
            inputStream.close();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
